Marine Aquaculture
Gbogbo ọrọ náà
For most of human history the sea seemed an endless larder. We hunted fish the way our distant ancestors hunted game, simply taking as much as we could. But modern boats, giant nets and sonar have made us so efficient that wild fish stocks are collapsing one after another. The great question for the oceans is no longer how to catch more fish, but how to keep catching fish at all.
In this lesson you will learn how overfishing damages target species, bycatch and whole food chains, and how marine aquaculture, the farming of fish, shellfish and seaweed, is being used to take the pressure off wild stocks. You will weigh the real benefits and the real risks of fish farming, and study the management strategies, from mesh sizes and quotas to closed seasons and international agreements, that aim to make fishing sustainable.
Ebumnobi
- 3.4.1 Describe and explain the impacts of exploitation of marine species, limited to: (a) overfishing and overharvesting of marine species (b) effect on target and bycatch species (c) effect on food chains.
- 3.4.2 Define marine aquaculture as the farming of marine species in captivity, limited to: (a) fish (b) crustaceans (c) seaweeds. Knowledge of specific species is not required.
- 3.4.3 Describe and explain the impacts of marine aquaculture, limited to: (a) reduced exploitation of natural fisheries (b) increased food supply for humans (c) risk of escape (d) risk of disease (e) local food webs (f) nutrient enrichment from waste (g) energy usage (h) source of food for farmed species.
- 3.4.4 Describe and explain strategies for the management of the harvesting of marine species, limited to: (a) limits on size of boat and overall net size (b) increased mesh size of nets (c) sustainable methods: pole and line (d) quotas (e) closed seasons (f) limited number of fishing days (g) protected areas (h) conservation laws (i) international agreements: implementation and monitoring.
- 3.4.5 Discuss the benefits and limitations of strategies for management of the harvesting of marine species.
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Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
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Akwụkwọ Ọmụmụ
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Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Marine Aquaculture. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Overfishing means catching fish: A. only during the breeding season B. faster than they can reproduce C. with pole and line D. inside a protected area Answer: B
- Marine aquaculture is best defined as: A. catching wild fish with large nets B. the farming of marine species in captivity C. protecting fish breeding grounds D. setting quotas on catches Answer: B
- Increasing the mesh size of a net helps a fishery because it: A. catches more fish B. lets young fish escape to breed C. uses less fuel D. reduces the boat size Answer: B
- Animals caught that are not the intended target are called: A. quota fish B. bycatch C. farmed fish D. juveniles Answer: B
- Which method produces almost no bycatch? A. bottom trawling B. drift nets C. pole and line D. dredging Answer: C
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Marine Aquaculture? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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